Updated Checked by the Tax-Services.ca editorial team How we check
Office expenses are the small things you use up running your business: pens, paper clips, stationery, stamps. The CRA puts them on line 8810 of form T2125, and they cut your taxable income dollar for dollar. On $1,500 of claims, a self-employed person in Ontario with $60,000 of net income saves about $487 in tax and CPP.
Generally, you can deduct any reasonable current expense you incur to earn business income.
Expenses section of form T2125, canada.ca
Which office expenses can you deduct?
The CRA splits the small stuff into two lines, and the split trips people up. Line 8810, office expenses, is for items that aren’t tied to your workspace, like pens, pencils, paper clips and postage. Line 8811, office stationery and supplies, is for items that relate to the workspace itself.
Does it matter which line you pick? For the tax you pay, no. The deduction is the same. It matters because a clean split makes your return easy to read if the CRA ever asks a question.
| What you bought | Where it goes on form T2125 |
|---|---|
| Pens, pencils, paper clips, stamps | Line 8810, office expenses |
| Supplies tied to your workspace | Line 8811, office stationery and supplies |
| Desk, chair, filing cabinet, calculator | Capital cost allowance, not a current expense |
| Share of rent, heat, power, insurance for a home workspace | Business-use-of-home expenses, Part 7 |
Why isn’t a new desk an office expense?
Because it lasts. The CRA treats items like desks, chairs, filing cabinets and even calculators as capital property. You don’t deduct the whole price in the year you buy them. You claim capital cost allowance, which spreads the cost over the years you use the item.
That’s a hassle for a $40 calculator. Still, the CRA names it, so we wouldn’t put it on line 8810 and hope nobody looks. If you buy a lot of equipment, the corporate tax calculator is a fair place to see how a smaller profit changes the tax bill for a company.
What does a $1,500 claim actually save you?
Take a sole proprietor in Ontario who nets $60,000 before office costs. The self-employed tax calculator shows $14,602.92 of income tax and CPP on that figure. Now say you spent $1,500 on office items. Your net income drops to $58,500, and the total falls to $14,115.45.
That’s $487.47 back in your pocket, or about 32 cents on each dollar you spent. Part of it is income tax ($308.97 less) and part is CPP, since you pay both halves on net business income. The calculator takes net income as an input, so subtract your expenses yourself before you type the figure in. It also leaves out GST/HST and EI.
Notice the direction, too. Spending $1,500 to save $487 is not a bargain. A deduction only refunds a share of money you already spent. Buy what the business needs and skip the rest, and don’t think of a deduction as free money, because it’s your own cash first and a refund of only a few bucks on the dollar later.
Small claims add up, though.
Can you claim part of your home as an office?
Sometimes. The CRA lets you deduct a share of home costs when the workspace is your principal place of business. It also works if you use the space only to earn business income and you meet clients, customers or patients there on a regular basis.
The share comes from a reasonable measure, such as the area of your workspace divided by the area of your home. Heating, electricity, insurance, cleaning, property tax and mortgage interest can all be part of the pool. There’s one hard limit: the claim can’t create or increase a business loss. Whatever you can’t use this year carries forward, as long as you keep meeting the conditions.
One trap sits in the fine print. If you claim capital cost allowance on the business part of your house, capital gains and recapture rules can apply when you sell. Before you do, run a sale through the capital gains tax calculator to see the size of the risk.
What if you’re registered for GST/HST?
Then the amount you enter isn’t the amount on the receipt. The same CRA page says to reduce the business expenses you show on the form by the input tax credit. So if you bought $100 of supplies in Ontario and paid $13 of HST, you’d claim $13 back through your GST/HST return and put $100 on line 8810, not $113. If you’re not registered, there’s no credit, and the full $113 is the expense. It’s an easy thing to get wrong when you’re typing totals from a pile of receipts, and it’s one reason the bookkeeping matters.
What does a small business really buy in a year?
Think of Maya, who runs a bookkeeping practice from a spare room in Hamilton. Her yearly office list is dull: printer paper, envelopes, a box of pens, postage, a pack of folders. She keeps the receipts in one envelope marked by month, tallies it on the last day of each quarter, and the total lands on line 8810 with no fuss. The laptop and the desk go through capital cost allowance instead. Dull is good here. Routine tidy-ups beat a heroic search through a shoebox every time.
What goes wrong with office expenses?
Most problems come from records, not rules. Keep the receipt.
A bank statement shows you paid someone, but it doesn’t show what you bought.
The second problem is mixing personal and business items. A printer that serves the family and the business needs a sensible split, not a full claim. And if you get a grant that covers part of an office purchase, the cost you deduct drops by that amount.
Watch the instalment side as well. A higher profit can push you into quarterly payments, and the tax instalments calculator gives you a rough idea of what the CRA might expect.
How we checked the figures
The line descriptions, the capital property examples and the home workspace tests come from the Canada Revenue Agency‘s guidance for form T2125, read in September 2026. The tax figures come from this site’s self-employed calculator, which uses 2026 federal and Ontario rates. This is an independent guide, separate from any government body.
Frequently asked questions
What is the difference between line 8810 and line 8811?
Line 8810 covers small items not tied to your workspace, like pens and stamps. Line 8811 covers stationery and supplies related to the workspace.
Can I deduct a desk or chair as an office expense?
No. The CRA treats desks, chairs, filing cabinets and calculators as capital property, so you claim capital cost allowance over time.
Can I claim my home office?
Yes, if it is your principal place of business, or you use it only for business and meet clients there regularly. The claim can't create a loss.
What if I can't use all my home costs this year?
The unused part carries forward to later years, provided you still meet the conditions.
Do I need receipts?
Keep them. A receipt shows what you bought, which a bank statement does not.
- Self-employed taxes in Canada: income, CPP and GST
How tax works when you are self-employed in Canada: reporting income and expenses, paying both halves of CPP, instalments and when to register for GST